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From "Stefan Guggisberg (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (JCR-2011) Replacing mixin type doesn't preserve properties
Date Mon, 25 Oct 2010 16:29:22 GMT

     [ https://issues.apache.org/jira/browse/JCR-2011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Stefan Guggisberg resolved JCR-2011.

       Resolution: Fixed
    Fix Version/s: 2.2.0

resolved as duplicate of JCR-2788

> Replacing mixin type doesn't preserve properties
> ------------------------------------------------
>                 Key: JCR-2011
>                 URL: https://issues.apache.org/jira/browse/JCR-2011
>             Project: Jackrabbit Content Repository
>          Issue Type: Improvement
>          Components: jackrabbit-core
>            Reporter: Charles Brooking
>            Priority: Minor
>             Fix For: 2.2.0
> NodeImpl.setPrimaryType(String) attempts to "redefine" nodes and properties that were
defined by the previous node type if they also appear in the new type. If there is no matching
definition for a node/property in the new type - or value conversion for matched node/property
fails - only then are children removed. For example, say I have a node "harry", with a primary
type "Human" that defines a "bloodgroup" property. If I set the primary type to be an unrelated
type "Animal" that has a similar "bloodgroup" property, then its property value will survive
the call to setPrimaryType("Animal").
> The same is apparently not possible with mixins. NodeImpl.removeMixin(Name) immediately
removes all children that were defined by the mixin (strictly, those that are not present
in the effective node type resulting from the mixin being removed). In addition, NodeImpl.addMixin(Name)
immediately throws a NodeTypeConflictException if you attempt to add a mixin defining an identically-named
property prior to calling removeMixin. For example, say I have a node "matrix", with a mixin
type "movie" that defines a "title" property. If I wish to replace the "movie" mixin on that
node with another "jcr:title" mixin type, the existing "title" property will be deleted.
> This occurs regardless of the order in which removeMixin and addMixin are called, and
without session.save() being called between them. One option for coding this is to defer validation
(and possible node/property removal) until session.save() is called.
> This is not strictly a bug, as JSR-283 seems to leave the details of assigning node types
(section 5.5) unspecified. However, it does say for Node.removeMixin(String) that "Both the
semantic change in effective node type and the persistence of the
> change to the jcr:mixinTypes property occur on save" and ideally we could emulate the
nice behaviour in NodeImpl.setPrimaryType(String) for mixin types.

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